Extension-rule.



H GASSTROM 611. A. BENSON.

EXTENSION RULE.

APPUCATION TILED JULY 22. ms.

Patented FebLl, 1919.

LEW I 7 4 4) 4 T5311 5.3mm;

UNITED STATES PATENT OFFICE.

an oassrnon sun Joint a. IIII'SON, oar-am lpaeilcatlou a! Letters Patent.

Application me in; aa, um. um: I. new.

.a q v To all whom at may concern:

Be it known that we, Hmuux Gasernox and JOHN A. Benson, a subject of the Czar ussia and a citizen of the United States, at New York city,

ew York, have inventof R respectivetliy, residi county an State of ed'certain new and useful Improvements in.

Extension Rules, of which the following is V a full, clear, and exact description.

' of the connecting This invention relates to improvements in extension rules, one of the objects being to provide such a rule which will, when extended, be perfectly rigid and not liable to prematurely fold up.

To carry our invention into practice, we provide pivotally connected plates which are attached to the rule sections or members, the said plates being constructed so as to bind one against .the other to provide a frictional resistance, certain means being emplo ed to lock the rule sections while extend ed or folded. v A

, The chief object of our invention is to provide means to connect the members of an extensionrule, said means being arran to lock said rule sections while extend or folded without resortin to rings or any yieldable device, other an labs connecting members themselves, to produce frictions resistance. i v

'Our imgroved connection for sectional rule mem ers' constitutes an exceedingly cheap but ellicient means for pivotally eonnectmg the members of an extension rule, as but two elements are required, one on each rule sec ion.

In the dra Figure 1 illustrates a side elevation of an extension rule provided with ourimprovement;

Fig. 2 is an enlarged side view of one members;

Fig. 3 is a cross-sectional view thereof the section being taken on a line 88 in Fig. 6 is a similar view showing a portion of two of the rule members having. the connecting members applied thereto;

7 is'a cross sectional i'iew taken on time 7-4 in Fig. 2

In Fig.1, the minerals 1, 2, 8, 4, 5, and

to obviate the of pr g or 'willmthe 0! saw 10 11, H. Y.

Patented Feb. 4, 1919.

6 indicate the members of an extensible rule 7 arranged to be extended by turning the members thereof one'on another in a circu- Iar direction, the connecting members indi cated by 8 and 9 being arranged for such movement.

As one of the objects of our invention is necessity of the employment struct, or form, the members 8 and 9 in a manner to provide the necessary binding efl'ect when said members 8 and 9 are connected.

As far as we are aware, it has been the custom to provide rule sections with flat plates and also to employ a sprin to provide the necessary resistance to t e move ment of the sections of the rule.

Instead of em loying flat plates, we utilize a convexed p ate 8 and a. convexed plate 9 suitably connected for pivotal movement. As can be seen in Figs. 2 and 3, one of said plates is concaved and the other convexed on their adjoinin surfaces. The connecting member 8 consists of a plate 10 concaved longitudinally and transversely, said plate fasteners 12.

plate 9 consists of a convexed plate 13 havmg flan 14 and piercing points or fastenors 1 The plate'18 is convexed transvemeiy thereof.

e plates 10 and 18 are provided with ocking elements arranged to interlock when the sections of the rule are extended or folded. p

'The locking elements referred to are struck u from the material of the plate as indicated at 16 and 17 in Figs. 2 and 4; respectively, hence when the p tea are connected, as shown in 5, thestruck portions 17 become poo ate for the stru up' ortions 16 which constitute projections.

o pi'votally secure the plates 10 and 18 together, we provide the plate 18 withan Opening 18 to receive a struck up flange 19 on thp plate 10 which when turned over at 20, Fig. 5, forms a pivotal connection for the lates 10 and L8.

en the to face, the numeral 21 of the late 10, and has of a plate 18, the ends of said plates central portions being sepaind idating the face equivalent elements, we con plates are placed together, facc th numeral 22 the carrying flanges 11 and piercing points or i he ope g 18,

rated, but the flange 19 will extind through the o ening 18. When the a e 19 is turns over to form a flange 20, t e plates will be drawn 'toward one another, thereby causing saidtfilates to flatten to some extent, both longitu inally and transversely; thereby placing said plates under tension, said tension tending to force said plates apart in the manner'of an inserted spring.

When the plates are assembled, the struck up portions 16 will 'be insertedinto the pockets 17. When the plates are rotated. one-upon the other, the pockets 17 and struck up portions 16 will separate causing the plates 10 and 13 to yiel slightly. As

in the plate 13, is surrounded by a heading 23, there will be at all times after the plates are secured together a slight space to permit of the yieldingof said la-tes under circumstances above set forth. ig. 5 illustrates the plates 10 and 13 after they have been assembled.

The rule sections are placed between the flanges of the connecting plates, the piercing points 12 and 15 being forced into the wood as shown in Fig. 6.

By constructing and connecting the plates as above described, we are able to provide a pivotal connection for extensible rule sections having all the advantages of connec tions employirl'g a spring but none of the disadvantages. Furthermore, we are able to manufacture our improved connection far cheaper than if springs were employed. The plates of our connection are formed in a manner to provide a 5 ring action when said plates are secured tog then A still further advantage resides inthe fact that it is Ham-i to recess a rule.

member in one face only, as shown in Fig. 6. In other words, that portion of a rule memher which eerriesthe plate his the-only one that is recessed, hence the rule is not Weakenecl by being recessed in both faces.

'We clainras our invention;

1. A connection for the members of an extension rule, consisting of two lates, one of said plates being provided witi an. open ing, an annular shoulder carried by th other plate arranged to pass through such opening, and to be turned over to form a pivotal connecti0n,said plates being shaped to exert pressure against each other'when assembled 2. A connection for the members of an extension rule consisting of a plate concnved longitudinally and transversely thereof, said plate being rovided with pockets intermediate the si e edg'cs thereof, a second plate conce ved longitudinally and transversely thereof, projections carried by the last named plate to engage the pockets in the. first named plate, and means to pivotally secure the plates together.

3. A connection for the members of an extension rule consisting of a plate conca cd longitudinally and transversely thereof. said plate being provided with pockets interme diate the side edges thereof, a second plate concaved longitudinally and transversely thereof, projections carried by the last named plate to engage the pockets in the first named plate, means to pivotnlly 0on nect the plates together, and flan es carried by said plates to engage the mem ers of the rule.

Signed at the city of New York, N. Y.,

this 12th day of July, one thousand nine hundred and sixteen.

HERMAN GASSTROM. JOHN A. BENSON.

Witnesses:

ROBERT C. Rioii'rnn, FRED F. We ss. 

